Effects of individual promoters on the Direct Synthesis of methylchlorosilanes

Effects of Multiple Promotion of the Direct Synthesis Contact Mass with P, Zn, and Sn on the Synthesis of Methylchlorosilanes

“…A schematic of this configuration is presented in a prior publication [3]. Before each experiment about 50 mg of a particular contact mass of interest was placed on a diamond ATR-FTIR element that was enclosed by a stainless steel reaction cell with ports to flow a gas of interest across the contact mass.…”

“…The same experimental methodology used in our prior study [3] was used in the current study. Briefly, the contact mass of interest on the diamond element and in the flow reactor was heated in a 0.1 standard cubic feet per hour flow of ultra high purity argon (99.997%, Air Products) at a temperature of 300°C.…”

“…In the current contribution, we build on the singly promoted contact mass results detailed in our prior work [3] and expand our studies investigating doubly and triply promoted contact masses. Specifically, we present and interpret results below that were obtained from in situ ATR-FTIR and flow reactor studies of Zn-Sn-, Zn-P-, Sn-P-, and Zn-Sn-P-promoted contact masses.…”

“…Because of the industrial importance of the DS for the production of silicones, there have been many prior studies that have mapped out the effects of promoters on the selectivity and reactivity of contact masses for the DS [2][3][4][5][6][7][8][9][10]. It is the general consensus from the literature that when specific combinations of promoters are added together, a synergism between the promoters is typically observed.…”

“…Missing from prior research, however, has been in situ studies that investigate the working surface of the DS contact mass under reaction conditions. Toward this end, recent research from our laboratory [3] has investigated the effects of individually Zn-, Sn-, and P-promoted contact masses in situ with attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) at working conditions (1 bar MeCl, 300°C) and have coupled these results with flow reactor studies that determined the effects of the promoters on the reactivity and selectivity of the contact masses.…”